:root{--bg:#0f172a;--panel:#1e293b;--fg:#f1f5f9;--muted:#94a3b8;--accent:#38bdf8;--ok:#16a34a;--bad:#dc2626}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--fg);overscroll-behavior:none;font-family:system-ui,-apple-system,sans-serif}.app{max-width:480px;min-height:100%;padding:max(12px, env(safe-area-inset-top)) 12px max(12px, env(safe-area-inset-bottom));flex-direction:column;gap:10px;margin:0 auto;display:flex}header{justify-content:space-between;align-items:center;display:flex}h1{margin:0;font-size:1.25rem}.gear{color:inherit;cursor:pointer;opacity:.8;background:0 0;border:0;padding:4px;font-size:1.3rem;line-height:1}.stats{background:var(--panel);border-radius:10px;padding:10px 12px}.line{justify-content:space-between;font-size:.95rem;display:flex}.meter{background:#334155;border-radius:3px;height:6px;margin-top:8px;display:block;overflow:hidden}.meter>span{background:var(--accent);height:100%;display:block}.menu{flex-direction:column;gap:10px;display:flex}.note{color:var(--muted);font-size:.85rem}.bad{color:var(--bad)}.deck{background:var(--panel);border-radius:10px;justify-content:space-between;align-items:center;gap:8px;padding:10px 12px;display:flex}.deck.earned{outline:1px solid var(--accent)}.row{gap:6px;display:flex}button{font:inherit;color:var(--fg);cursor:pointer;background:#334155;border:0;border-radius:8px;padding:10px 14px}button:disabled{opacity:.45;cursor:default}button.quiet{background:0 0}details{flex-direction:column;gap:8px;display:flex}summary{cursor:pointer}details>*+*{margin-top:8px}input,textarea{font:inherit;color:var(--fg);background:var(--panel);border:1px solid #334155;border-radius:8px;width:100%;padding:8px}.flash{text-align:center;background:var(--panel);cursor:pointer;border-radius:14px;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:14px;min-height:220px;padding:20px;display:flex}.flash.done{cursor:default}.front{white-space:pre-wrap;font-size:1.5rem}.back{color:var(--accent);white-space:pre-wrap;border-top:1px solid #334155;padding-top:14px;font-size:1.2rem}.remaining{text-align:center}.reward{text-align:center;color:var(--accent);font-size:.9rem}.grades{grid-template-columns:repeat(4,1fr);gap:6px;display:grid}.grades button{flex-direction:column;align-items:center;gap:2px;padding:10px 4px;display:flex}.grades small{opacity:.8;font-size:.7rem}.grades .again{background:var(--bad)}.grades .good{background:var(--ok)}.grades .easy{background:#0369a1}.media{border-radius:6px;max-width:100%;max-height:40vh;margin:8px auto;display:block}audio.media{width:100%}.account{flex-direction:column;flex:1;justify-content:center;gap:14px;display:flex}.account .hint{color:var(--muted);margin:0;font-size:.9rem}.account a{color:var(--accent)}.muted{opacity:.6;font-weight:400}.field{gap:4px;font-weight:700;display:grid}.tabs{gap:8px;display:flex}.tab{background:0 0;border:1px solid #334155;flex:1}.tab.active{background:var(--panel);border-color:var(--accent)}.alert{color:#fca5a5;margin:0}button.primary{background:var(--accent);color:#0f172a;font-weight:700}button.link{color:var(--muted);background:0 0;text-decoration:underline}